In a recent video, Munich based design firm Kurzgesagt gives two explanations for what would happen if a person had a coin-sized black hole in their pocket. In the first example, they explain what would happen if the coin had the mass of United States nickel. The second example supposes that the diameter of the black hole is the same diameter of a nickel, which would give it roughly the same mass as the Earth. Neither case ends well for the person with the black hole in their pocket.